Hi guys - I have a 1973 RV125L with a single range transmission and noticed that the head has got holes for a long reach and a short reach plug - the question is which one do I use and what plugs are supposed to in there ? I guess one is for on road and one for off road but which is which ? Mal.

Hi guys - I have a 1973 RV125L with a single range transmission and noticed that the head has got holes for a long reach and a short reach plug - the question is which one do I use and what plugs are supposed to in there ? I guess one is for on road and one for off road but which is which ? Mal.

I've never even been around one of those little guys but looks like fun....one hole is for a compression release kit or the factory block off plug.

Only install one spark plug....use the block off plug and it's gasket for the other hole. Plugging the hole with another spark plug can cause damage. It has to do with the increased heat generated by that extra spark plug...... even though the other plug is the only one lighting up.

It was explained a lot better than I just did and in more detail and to the satisfaction of many by a very trusted, knowledgeable professional vintage/modern motorcycle mechanic on another forum a few years back.

Looks like the head may have been superceded by another later but is this the fin arrangement on yours?

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